image-tools: T6176: add console hint during image install

(cherry picked from commit 428d03e47e7d01b08ccb8cf1acc0ab8a53275286)

1 files changed, 16 insertions, 0 deletions

diff --git a/src/op_mode/image_installer.py b/src/op_mode/image_installer.py
index a3413b2c6..d65cd6b1d 100755
--- a/src/op_mode/image_installer.py
+++ b/src/op_mode/image_installer.py
@@ -23,6 +23,8 @@ from shutil import copy, chown, rmtree, copytree
 from glob import glob
 from sys import exit
 from os import environ
+from os import readlink
+from os import getpid, getppid
 from typing import Union
 from urllib.parse import urlparse
 from passlib.hosts import linux_context
@@ -564,6 +566,20 @@ def copy_ssh_host_keys() -> bool:
     return False
 
 
+def console_hint() -> str:
+    pid = getppid() if 'SUDO_USER' in environ else getpid()
+    try:
+        path = readlink(f'/proc/{pid}/fd/1')
+    except OSError:
+        path = '/dev/tty'
+
+    name = Path(path).name
+    if name == 'ttyS0':
+        return 'S'
+    else:
+        return 'K'
+
+
 def cleanup(mounts: list[str] = [], remove_items: list[str] = []) -> None:
     """Clean up after installation